UBB.threads PHP Forum Software Community Forums News and Releases Pre-Sales Questions updating from old version to latest version of ubb

any topic where someone has done it.. i belive i have 6.2 or 6.2.1 (mysql) but for some reason 6.5.5 does not allow you to upgrade from there. what are the other options? i cannot re-download 6.2.1 that i could start from the beginning also:(